All-Wheel Drive
When to Check Lubricant
It is not necessary to regularly check fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired.
How to Check Lubricant

To get an accurate reading, the vehicle should be on a level surface.
If the level is below the bottom of the filler plug hole, located on the transfer case, you’ll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole.
Use care not to overtighten the plug.
What to Use
To determine what kind of lubricant to use.
See also:
How OnStar® Service Works
In order to provide you with OnStar® services, your
vehicle’s OnStar® system has the capability of
recording and transmitting vehicle information.
This information is automatically sent to an ...
Anti-theft Alarm System
This vehicle has an anti-theft alarm
system. ...
Event Data Recorders
This vehicle has an Event Data Recorder (EDR). The main purpose of an EDR is
to record, in certain crash or near crash-like situations, such as an airbag deployment
or hitting a road obstacle, dat ...
